Back cushion



FIG. 1 is a perspective and environmental view of a back cushion showing my new design separately, without the cover, for clarity of illustration;

FIG. 2 is an enlarged top plan view thereof;

FIG. 3 is an enlarged bottom plan view thereof;

FIG. 4 is an enlarged left side view thereof, the right side being a mirror image of that shown;

FIG. 5 is an enlarged front elevation view thereof;

FIG. 6 is an enlarged rear elevation view thereof;

FIG. 7 is a perspective view of a combined back cushion and cover therefor; and,

FIG. 8 is an enlarged top plan view of FIG. 7, the bottom being substantially a mirror image of that shown.

The broken line showing of a chair in FIG. 1 is for illustrative purposes only and forms no part of the claimed design.

The side opposite that shown in FIG. 7 is a mirror image of that shown and the rear of the combined back cushion and cover therefor is flat and unornamented. 

The ornamental design for a back cushion, as shown and described. 